Triangle read by rows: T(n,k) is the number of labeled weakly graded (ranked) posets with n elements and rank k.
A361951
Triangle read by rows: T(n,k) is the number of labeled weakly graded (ranked) posets with n elements and rank k.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =2a(6) =0a(7) =1a(8) =12a(9) =6a(10) =0a(11) =1a(12) =86a(13) =108a(14) =24a(15) =0a(16) =1a(17) =840a(18) =2190a(19) =840a(20) =120a(21) =0a(22) =1a(23) =11642a(24) =55620a(25) =31800a(26) =6840a(27) =720a(28) =0a(29) =1
External references
- oeis: A361951